If we delete a list of contacts (contact group) from Emma, can we still access the response after we deleted the contact list it was sent to

If we send a mailing to a list of contacts (contact group) and want to delete that list after it is sent, can we still access the analytics? Is there a set time frame we need to keep the contacts in EMMA in order to pull the stats/response?

The response data will still be viewable for your mailings, even if you delete contacts from your audience list. There isn't a time limit for this to be in effect- your mailing response data will show all contact interactions with your campaign, whether or not those recipients reside in your audience any longer.